The Impact of an Oxygen Dopant in an ideal Bi-2212 Crystal

Abstract

Recent scanning tunneling microscopy studies have shown that local nanoscale pairing inhomogenities are correlated with interstitial oxygen dopants in Bi-2212. Combining electrostatic and cluster calculations, in this paper the impact of a dopant on the local Madelung and charge transfer energies, magnetic exchange J, Zhang-Rice mobility, and interactions with the lattice is investigated. It is found that electrostatic modifications locally increases the charge transfer energy and slightly suppresses J. It is further shown that coupling to c-axis phonons is strongly modified near the dopant. The combined effects of electrostatic modifications and coupling to the lattice yield broadened spectral features, reduced charge gap energies, and a sizable local increase of J. This implies a strong local interplay between antiferromagnetism, polarons, and superconducting pairing.

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References in corpus (8)

• Inelastic Light Scattering From Correlated Electrons
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• Imaging the impact on cuprate superconductivity of varying the inter-atomic distances within individual crystal unit-cells
• Inhomogeneity-induced enhancement of the pairing interaction in cuprates
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• Synergistic Polaron Formation in the Hubbard-Holstein Model at Small Doping
• Local Strong Coupling Pairing in $D$-Wave Superconductor with Inhomogeneous Bosonic Modes
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